I want to give you a very important friendly compliment about two-step authentication. When I select the Yubikey physical security keys, the system throws a backup codes window. However, the level of security between the physical security key and backup codes is not acceptable, because we cannot compare Yubikey's physical security keys with backup codes that can be stolen by advanced hackers and spyware on a virus-infected device. Therefore, what the system does wrong is that it throws up a window of backup codes that can be copied by hackers. Of course, I can use all the backup codes, but having to log in 16 times, all those codes would be used up and worthless. However, this is a long process as you need to log in 16 times and use all backup codes 16 times. Sorry, maybe you changed the system? What I mean is that maybe now the system doesn't dump the backup codes box when I turn on and activate 2-step verification?

If I add and enable code generation from an authenticator app now, will the system display backup codes?

Note: Currently, I am only using two Yubikey physical security keys for two-factor authentication. These keys were added a long time ago, so I am not familiar with your current system. When I originally added the physical keys, a window with backup codes appeared. However, I intentionally used up all the displayed codes to prevent spies or hackers from using them if they were stolen. All backup codes were deliberately exhausted to prevent hacking, as hackers and spyware can copy such codes. Therefore, the security level of a Yubikey should not be associated with backup codes.

My question is: Does your current system still generate backup codes when I enable and activate two-factor authentication?